Luis A. Gonzalez Jr., 21, and Alexandre R. Gonzalez, 19, were both arrested Monday and charged with first-degree murder. Authorities say the two men killed Richard W. Martinez, 25, on May 13. His body was found inside a Chevrolet Impala in the woods near Poco Loop in Moon Lake Estates.

Pasco sheriff's spokesman Kevin Doll said detectives think the crime began as "a robbery, possibly over drugs and money."

Witnesses linked the brothers to the crime, reports state.

The brothers' father was also arrested Monday on a charge of tampering with a witness. Luis A. Gonzalez, 40, is accused of threatening to rape a woman because he believed she was "a snitch," the report states. Witnesses also told investigators that Gonzalez helped his sons dispose of evidence from the killing.

"We're not commenting further on that," Doll said.

The brothers and their father declined an interview request Monday by the Times.

Both brothers are Latin King gang members, authorities say. The youngest — Alexandre "White Boy" Gonzalez, whose first arrest was at 11 on a charge of aggravated battery with a deadly weapon — told a witness hours before the murder that he planned to rob Martinez, the Sheriff's Office says.

Martinez also had a criminal record, which included serving more than two years in prison for trafficking and possession of controlled substances and grand theft of a motor vehicle, according to the Florida Department of Corrections. He was released from prison in June 2011. He died from multiple gunshot wounds, authorities say.

A witness said Luis Gonzalez Jr. poured gasoline on the car and both brothers lit the vehicle on fire, the reports say.

The brothers, who live together in Port Richey, were both held without bail at the Pasco jail. Their father, of Hudson, was being held in lieu of $5,000 bail.